<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>七格布局2</title>
  <style>
    body {
      margin: 0;
    }

    .wapper {
      width: 100%;
      background-color: #f4f0ea;
      padding: 3em 0;
      /* height: 500px; */
    }

    .outer {
      margin: 0 auto;
      width: 1420px;
      /* height: 500px; */
      background-color: darkgrey;
      overflow: hidden;
    }

    .outer ::after {
      content: '';
      display: block;
      clear: both;
    }

    .pro {
      width: 220px;
      height: 450px;
      float: left;
      background-color: darkorange;
      margin-right: 5px;
      margin-top: 5px;
    }

    .pro:nth-child(1) {
      width: 500px;
      height: 900px;

    }

    .pro:nth-child(2),
    .pro:nth-child(3) {
      width: 450px;
      height: 450px;

    }
  </style>
</head>

<body>
  <div class="wapper">
    <div class="outer">
      <div class="pro">

      </div>
      <div class="pro">

      </div>
      <div class="pro"></div>
      <div class="pro"></div>
      <div class="pro"></div>
      <div class="pro"></div>
      <div class="pro"></div>
    </div>
  </div>

</body>

</html>